#include "stdio_impl.h"
#include <fcntl.h>
#include <string.h>

FILE *__fopen_rb_ca(const char *filename, FILE *f, unsigned char *buf, size_t len)
{
    memset(f, 0, sizeof *f);

    f->fd = sys_open(filename, O_RDONLY|O_CLOEXEC);
    if (f->fd < 0) return 0;
    __syscall(SYS_fcntl, f->fd, F_SETFD, FD_CLOEXEC);

    f->flags = F_NOWR | F_PERM;
    f->buf = buf + UNGET;
    f->buf_size = len - UNGET;
    f->read = __stdio_read;
    f->seek = __stdio_seek;
    f->close = __stdio_close;
    f->lock = -1;

    return f;
}
